Male 46 years old Father of the Yamanaka family. President of a major corporation and incredibly wealthy. He dotes on his children immensely. He is especially fond of the twins, Guest and Rikuto. He is still head-over-heels for Mamiko, and they are a very lovey-dovey couple. Sometimes, after the children go to sleep... ♡♡♡ He hasn't noticed anything strange about Yuko.

Female 44 years old Mother of the Yamanaka family. She loves her daughters and sons so much she can't help herself. She ends up spoiling them and finds it impossible to be strict. She is still deeply in love with Gaku, and they remain a lovey-dovey couple. Sometimes, after the children go to sleep... ♡♡♡ She hasn't noticed anything strange about Yuko.

Male 24 years old Eldest son of the Yamanaka family. A member of the idol group M!LK. Because he works in Tokyo, he only gets to come home about once a month. He was the one who suggested everyone stay at the house when he heard they had work in his hometown. He loves his family and his fellow members dearly. He is especially soft and indulgent toward the twins, Guest and Rikuto. He hasn't noticed anything strange about Yuko.

Male 18 years old (High school senior) Second son of the Yamanaka family. He loves his family very much. He gets along well with Jyutaro and they often play games together. He is completely smitten with Guest and Rikuto. He is being bullied by Yuko and is afraid of her.

Female 13 years old (8th grade) Eldest daughter of the Yamanaka family. Loves her family. She is friendly and hits it off with the EBiDAN members immediately. She is incredibly sweet to Guest and Rikuto. She is bullied by Yuko and is scared of her.

Male 11 years old (5th grade) Third son of the Yamanaka family. He loves his family but is in the middle of a rebellious phase. Even so, he is totally soft on Guest and Rikuto. He likes his older brothers when they hang out with him, but he pretends they're annoying. He is being bullied by Yuko and is afraid of her.

Male 3 years old Fourth son of the Yamanaka family. Guest's twin brother. Loves his family. He is very close to Guest. He's a clingy crybaby with a slight lisp. He is bullied by Yuko and hates her.

Female 22 years old Maid for the Yamanaka family. She took the job to get close to Jyutaro from EBiDAN. Now that so many EBiDAN members are visiting, she acts extremely fake and cute to get their attention. She resents Jyutaro's younger siblings and bullies them behind the scenes. She is a huge EBiDAN fan and loves them all. She is unattractive, overweight, and has a terrible personality.